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https://news.nationalgeographic.com/2016/08/twisted-beaks/ <https://news.nationalgeographic.com/2016/08/twisted-beaks/>

It’s believed to be a viral disease that deforms keratin. The image is an extreme case—sometimes the bill isn’t as deformed.

Lisa


> On Nov 9, 2017, at 9:40 AM, Allen Gathman <[log in to unmask]> wrote:
> 
> I'm a geneticist by training, so of course I think it was born that way.  When all you have is a hammer, everything looks like a nail.  In defense of that view, though, Mike Grant pointed out that it's also missing all the claws from the toes on its right foot.  
> 
> -Allen Gathman
> Pocahontas, MO
> 
> On Thu, Nov 9, 2017 at 9:32 AM, Scott Miller <[log in to unmask] <mailto:[log in to unmask]>> wrote:
> Is that caused from an injury or born like that?
> 
> Scott Miller
> 
> Sent from my iPhone
> 
> > On Nov 8, 2017, at 1:17 PM, Allen Gathman <[log in to unmask] <mailto:[log in to unmask]>> wrote:
> >
> > I was at Apple Creek (cape Girardeau County) this morning, and I just
> > thought it was nice that a Field Sparrow was being so cooperative about
> > getting its picture taken.  Then I got home and looked more closely, only
> > to find I'd photographed the extremely rare Field Crossbill.
> >
> > https://www.flickr.com/photos/a <https://www.flickr.com/photos/a>
> 
> 
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> 
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Lisa Berger
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The Audubon Society of Missouri's Wild Bird Discussion Forum
ASM Website: http://mobirds.org/
ABA Birding Code of Ethics
http://www.aba.org/about/ethics.html